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  1. /* zutil.c -- target dependent utility functions for the compression library
  2.  * Copyright (C) 1995-2005, 2010, 2011, 2012 Jean-loup Gailly.
  3.  * For conditions of distribution and use, see copyright notice in zlib.h
  4.  */
  5.  
  6. /* @(#) $Id$ */
  7.  
  8. #include "zutil.h"
  9. #ifndef Z_SOLO
  10. #  include "gzguts.h"
  11. #endif
  12.  
  13. #ifndef NO_DUMMY_DECL
  14. struct internal_state      {int dummy;}; /* for buggy compilers */
  15. #endif
  16.  
  17. z_const char * const z_errmsg[10] = {
  18. "need dictionary",     /* Z_NEED_DICT       2  */
  19. "stream end",          /* Z_STREAM_END      1  */
  20. "",                    /* Z_OK              0  */
  21. "file error",          /* Z_ERRNO         (-1) */
  22. "stream error",        /* Z_STREAM_ERROR  (-2) */
  23. "data error",          /* Z_DATA_ERROR    (-3) */
  24. "insufficient memory", /* Z_MEM_ERROR     (-4) */
  25. "buffer error",        /* Z_BUF_ERROR     (-5) */
  26. "incompatible version",/* Z_VERSION_ERROR (-6) */
  27. ""};
  28.  
  29.  
  30. const char * ZEXPORT zlibVersion()
  31. {
  32.     return ZLIB_VERSION;
  33. }
  34.  
  35. uLong ZEXPORT zlibCompileFlags()
  36. {
  37.     uLong flags;
  38.  
  39.     flags = 0;
  40.     switch ((int)(sizeof(uInt))) {
  41.     case 2:     break;
  42.     case 4:     flags += 1;     break;
  43.     case 8:     flags += 2;     break;
  44.     default:    flags += 3;
  45.     }
  46.     switch ((int)(sizeof(uLong))) {
  47.     case 2:     break;
  48.     case 4:     flags += 1 << 2;        break;
  49.     case 8:     flags += 2 << 2;        break;
  50.     default:    flags += 3 << 2;
  51.     }
  52.     switch ((int)(sizeof(voidpf))) {
  53.     case 2:     break;
  54.     case 4:     flags += 1 << 4;        break;
  55.     case 8:     flags += 2 << 4;        break;
  56.     default:    flags += 3 << 4;
  57.     }
  58.     switch ((int)(sizeof(z_off_t))) {
  59.     case 2:     break;
  60.     case 4:     flags += 1 << 6;        break;
  61.     case 8:     flags += 2 << 6;        break;
  62.     default:    flags += 3 << 6;
  63.     }
  64. #ifdef DEBUG
  65.     flags += 1 << 8;
  66. #endif
  67. #if defined(ASMV) || defined(ASMINF)
  68.     flags += 1 << 9;
  69. #endif
  70. #ifdef ZLIB_WINAPI
  71.     flags += 1 << 10;
  72. #endif
  73. #ifdef BUILDFIXED
  74.     flags += 1 << 12;
  75. #endif
  76. #ifdef DYNAMIC_CRC_TABLE
  77.     flags += 1 << 13;
  78. #endif
  79. #ifdef NO_GZCOMPRESS
  80.     flags += 1L << 16;
  81. #endif
  82. #ifdef NO_GZIP
  83.     flags += 1L << 17;
  84. #endif
  85. #ifdef PKZIP_BUG_WORKAROUND
  86.     flags += 1L << 20;
  87. #endif
  88. #ifdef FASTEST
  89.     flags += 1L << 21;
  90. #endif
  91. #if defined(STDC) || defined(Z_HAVE_STDARG_H)
  92. #  ifdef NO_vsnprintf
  93.     flags += 1L << 25;
  94. #    ifdef HAS_vsprintf_void
  95.     flags += 1L << 26;
  96. #    endif
  97. #  else
  98. #    ifdef HAS_vsnprintf_void
  99.     flags += 1L << 26;
  100. #    endif
  101. #  endif
  102. #else
  103.     flags += 1L << 24;
  104. #  ifdef NO_snprintf
  105.     flags += 1L << 25;
  106. #    ifdef HAS_sprintf_void
  107.     flags += 1L << 26;
  108. #    endif
  109. #  else
  110. #    ifdef HAS_snprintf_void
  111.     flags += 1L << 26;
  112. #    endif
  113. #  endif
  114. #endif
  115.     return flags;
  116. }
  117.  
  118. #ifdef DEBUG
  119.  
  120. #  ifndef verbose
  121. #    define verbose 0
  122. #  endif
  123. int ZLIB_INTERNAL z_verbose = verbose;
  124.  
  125. void ZLIB_INTERNAL z_error (m)
  126.     char *m;
  127. {
  128.     fprintf(stderr, "%s\n", m);
  129.     exit(1);
  130. }
  131. #endif
  132.  
  133. /* exported to allow conversion of error code to string for compress() and
  134.  * uncompress()
  135.  */
  136. const char * ZEXPORT zError(err)
  137.     int err;
  138. {
  139.     return ERR_MSG(err);
  140. }
  141.  
  142. #if defined(_WIN32_WCE)
  143.     /* The Microsoft C Run-Time Library for Windows CE doesn't have
  144.      * errno.  We define it as a global variable to simplify porting.
  145.      * Its value is always 0 and should not be used.
  146.      */
  147.     int errno = 0;
  148. #endif
  149.  
  150. #ifndef HAVE_MEMCPY
  151.  
  152. void ZLIB_INTERNAL zmemcpy(dest, source, len)
  153.     Bytef* dest;
  154.     const Bytef* source;
  155.     uInt  len;
  156. {
  157.     if (len == 0) return;
  158.     do {
  159.         *dest++ = *source++; /* ??? to be unrolled */
  160.     } while (--len != 0);
  161. }
  162.  
  163. int ZLIB_INTERNAL zmemcmp(s1, s2, len)
  164.     const Bytef* s1;
  165.     const Bytef* s2;
  166.     uInt  len;
  167. {
  168.     uInt j;
  169.  
  170.     for (j = 0; j < len; j++) {
  171.         if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
  172.     }
  173.     return 0;
  174. }
  175.  
  176. void ZLIB_INTERNAL zmemzero(dest, len)
  177.     Bytef* dest;
  178.     uInt  len;
  179. {
  180.     if (len == 0) return;
  181.     do {
  182.         *dest++ = 0;  /* ??? to be unrolled */
  183.     } while (--len != 0);
  184. }
  185. #endif
  186.  
  187. #ifndef Z_SOLO
  188.  
  189. #ifdef SYS16BIT
  190.  
  191. #ifdef __TURBOC__
  192. /* Turbo C in 16-bit mode */
  193.  
  194. #  define MY_ZCALLOC
  195.  
  196. /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
  197.  * and farmalloc(64K) returns a pointer with an offset of 8, so we
  198.  * must fix the pointer. Warning: the pointer must be put back to its
  199.  * original form in order to free it, use zcfree().
  200.  */
  201.  
  202. #define MAX_PTR 10
  203. /* 10*64K = 640K */
  204.  
  205. local int next_ptr = 0;
  206.  
  207. typedef struct ptr_table_s {
  208.     voidpf org_ptr;
  209.     voidpf new_ptr;
  210. } ptr_table;
  211.  
  212. local ptr_table table[MAX_PTR];
  213. /* This table is used to remember the original form of pointers
  214.  * to large buffers (64K). Such pointers are normalized with a zero offset.
  215.  * Since MSDOS is not a preemptive multitasking OS, this table is not
  216.  * protected from concurrent access. This hack doesn't work anyway on
  217.  * a protected system like OS/2. Use Microsoft C instead.
  218.  */
  219.  
  220. voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, unsigned items, unsigned size)
  221. {
  222.     voidpf buf = opaque; /* just to make some compilers happy */
  223.     ulg bsize = (ulg)items*size;
  224.  
  225.     /* If we allocate less than 65520 bytes, we assume that farmalloc
  226.      * will return a usable pointer which doesn't have to be normalized.
  227.      */
  228.     if (bsize < 65520L) {
  229.         buf = farmalloc(bsize);
  230.         if (*(ush*)&buf != 0) return buf;
  231.     } else {
  232.         buf = farmalloc(bsize + 16L);
  233.     }
  234.     if (buf == NULL || next_ptr >= MAX_PTR) return NULL;
  235.     table[next_ptr].org_ptr = buf;
  236.  
  237.     /* Normalize the pointer to seg:0 */
  238.     *((ush*)&buf+1) += ((ush)((uch*)buf-0) + 15) >> 4;
  239.     *(ush*)&buf = 0;
  240.     table[next_ptr++].new_ptr = buf;
  241.     return buf;
  242. }
  243.  
  244. void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
  245. {
  246.     int n;
  247.     if (*(ush*)&ptr != 0) { /* object < 64K */
  248.         farfree(ptr);
  249.         return;
  250.     }
  251.     /* Find the original pointer */
  252.     for (n = 0; n < next_ptr; n++) {
  253.         if (ptr != table[n].new_ptr) continue;
  254.  
  255.         farfree(table[n].org_ptr);
  256.         while (++n < next_ptr) {
  257.             table[n-1] = table[n];
  258.         }
  259.         next_ptr--;
  260.         return;
  261.     }
  262.     ptr = opaque; /* just to make some compilers happy */
  263.     Assert(0, "zcfree: ptr not found");
  264. }
  265.  
  266. #endif /* __TURBOC__ */
  267.  
  268.  
  269. #ifdef M_I86
  270. /* Microsoft C in 16-bit mode */
  271.  
  272. #  define MY_ZCALLOC
  273.  
  274. #if (!defined(_MSC_VER) || (_MSC_VER <= 600))
  275. #  define _halloc  halloc
  276. #  define _hfree   hfree
  277. #endif
  278.  
  279. voidpf ZLIB_INTERNAL zcalloc (voidpf opaque, uInt items, uInt size)
  280. {
  281.     if (opaque) opaque = 0; /* to make compiler happy */
  282.     return _halloc((long)items, size);
  283. }
  284.  
  285. void ZLIB_INTERNAL zcfree (voidpf opaque, voidpf ptr)
  286. {
  287.     if (opaque) opaque = 0; /* to make compiler happy */
  288.     _hfree(ptr);
  289. }
  290.  
  291. #endif /* M_I86 */
  292.  
  293. #endif /* SYS16BIT */
  294.  
  295.  
  296. #ifndef MY_ZCALLOC /* Any system without a special alloc function */
  297.  
  298. #ifndef STDC
  299. extern voidp  malloc OF((uInt size));
  300. extern voidp  calloc OF((uInt items, uInt size));
  301. extern void   free   OF((voidpf ptr));
  302. #endif
  303.  
  304. voidpf ZLIB_INTERNAL zcalloc (opaque, items, size)
  305.     voidpf opaque;
  306.     unsigned items;
  307.     unsigned size;
  308. {
  309.     if (opaque) items += size - size; /* make compiler happy */
  310.     return sizeof(uInt) > 2 ? (voidpf)malloc(items * size) :
  311.                               (voidpf)calloc(items, size);
  312. }
  313.  
  314. void ZLIB_INTERNAL zcfree (opaque, ptr)
  315.     voidpf opaque;
  316.     voidpf ptr;
  317. {
  318.     free(ptr);
  319.     if (opaque) return; /* make compiler happy */
  320. }
  321.  
  322. #endif /* MY_ZCALLOC */
  323.  
  324. #endif /* !Z_SOLO */
  325.